Apply by doing:
       cd /usr/src
       patch -p0 < 032_tcp2.patch

And then rebuild your kernel.

Index: sys/netinet/tcp_input.c
===================================================================
RCS file: /cvs/src/sys/netinet/tcp_input.c,v
retrieving revision 1.158.2.4
retrieving revision 1.158.2.5
diff -u -p -r1.158.2.4 -r1.158.2.5
--- sys/netinet/tcp_input.c     20 Mar 2005 23:44:05 -0000      1.158.2.4
+++ sys/netinet/tcp_input.c     1 Apr 2005 15:32:53 -0000       1.158.2.5
@@ -1406,13 +1406,17 @@ trimthenstep6:

       /*
        * If last ACK falls within this segment's sequence numbers,
-        * record its timestamp.
-        * Fix from Braden, see Stevens p. 870
+        * record its timestamp if it's more recent.
+        * Cf fix from Braden, see Stevens p. 870
        */
       if (opti.ts_present && TSTMP_GEQ(opti.ts_val, tp->ts_recent) &&
           SEQ_LEQ(th->th_seq, tp->last_ack_sent)) {
+               if (SEQ_LEQ(tp->last_ack_sent, th->th_seq + tlen +
+                   ((tiflags & (TH_SYN|TH_FIN)) != 0)))
+                       tp->ts_recent = opti.ts_val;
+               else
+                       tp->ts_recent = 0;
               tp->ts_recent_age = tcp_now;
-               tp->ts_recent = opti.ts_val;
       }

       /*

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